This circuit is from an article that appeared in the June 1974 issue of Radio Electronics magazine. The circuit used integrated circuits and transistors of the time and included the power supply.
We found this circuit in an old American publication from the 1980s. Transistors can be...
The circuit shown uses the LM340 but applies to other regulators. We found this setting in...
This circuit generates signals that depend on resistors and capacitor, producing a tone in a...